Buff orpinton eggs

Hi i have 2 of them pluss a cock i posted a pic a few weeks back i have just put some eggs in the incubator but also i got some from a friend in scotland to go in there too but they are much bigger than mine does this mean that my hens are too young to have fertile eggs i think they where born last october or is it just the way the egga are thanx for any help.

I noticed you didn't get an answer yet, so hopefully this will help. Pullet eggs are generally smaller than hen eggs, so that is probably why. After their first molt, the eggs get bigger. Pullet eggs also don't seem to hatch as well, although they can still hatch so I wouldn't give up on them. It is good you put some of each in. Let us know how they do.